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Discontinued Operations (Narrative) (Details) $ in Millions, $ in Billions |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 48 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 02, 2022 USD ($) | Oct. 01, 2020 USD ($) $ / MMBTU $ / bbl | Dec. 17, 2019 | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 CAD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2024 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  |  |  |  |  |  | $ 182 | $ 785 |
Gain on asset dispositions |  |  |  |  |  |  |  |  |  | (1) | 222 |
Gain recognized on sale of business, pre-tax |  |  |  |  |  |  |  |  |  | (1) | 222 |
Foreign currency translation adjustment | [1] |  |  |  |  |  |  |  |  |  | 1,237 |
Charge on early retirement of debt, cash retirement costs |  |  |  |  |  |  |  |  | $ 59 |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Charge on early retirement of debt, cash retirement costs |  |  |  |  |  |  |  |  | 89 |  |  |
Barnett Shale [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  |  |  |  |  |  | 182 | $ 748 |
Goodwill |  |  |  |  |  |  |  |  |  | $ 88 |  |
Divestitures of property and equipment |  |  | $ 490 |  |  |  |  |  |  |  |  |
Contingent earnout payments |  |  | $ 65 |  |  |  |  |  |  |  |  |
Henry Hub gas price for contingent earnout payment upside | $ / MMBTU |  |  | 2.75 |  |  |  |  |  |  |  |  |
WTI oil price for contingent earnout payment upside | $ / bbl |  |  | 50 |  |  |  |  |  |  |  |  |
Gain on asset dispositions |  |  |  |  |  |  |  |  | 110 |  |  |
Gain recognized on sale of business, pre-tax |  |  |  |  |  |  |  |  | 110 |  |  |
Barnett Shale [Member] | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent earnout payments |  | $ 195 |  |  |  |  |  |  |  |  |  |
Contingent earnout payments received |  | $ 65 |  |  |  |  |  |  |  |  |  |
Barnett Shale [Member] | Other Current Assets |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent earnout payments |  |  |  |  |  |  |  |  | 65 |  |  |
Contingent payments valuation |  |  |  |  |  |  |  |  | 65 |  |  |
Barnett Shale [Member] | Other Noncurrent Assets |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent earnout payments |  |  |  |  |  |  |  |  | 111 |  |  |
Contingent payments valuation |  |  |  |  |  |  |  |  | $ 111 |  |  |
Barnett Shale [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent earnout payment period |  |  |  |  |  |  |  |  |  |  |  | The contingent payment period commenced on January 1, 2021 and has a term of four years.
Barnett Shale [Member] | BKV [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of estimated U.S. total proved reserves associated with divestiture assets |  |  |  | 45.00% |  |  |  |  |  |  |  |
Divestitures of property and equipment |  |  | $ 490 |  |  |  |  |  |  |  |  |
Henry Hub gas price for contingent earnout payment upside | $ / MMBTU |  |  | 2.75 |  |  |  |  |  |  |  |  |
WTI oil price for contingent earnout payment upside | $ / bbl |  |  | 50 |  |  |  |  |  |  |  |  |
Contingent earnout payment period |  |  |  |  |  |  |  |  | The contingent payment period commenced on January 1, 2021 and has a term of four years. |  |  |
Barnett Shale [Member] | BKV [Member] | Scenario Forecast [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent earnout payments |  |  |  |  |  |  |  |  |  |  |  | $ 260
Canadian Business Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on asset dispositions |  |  |  |  |  | $ 223 |  |  |  |  |  |
Proceeds from the sale of business |  |  |  |  |  | 2,600 | $ 3.4 |  |  |  |  |
Gain recognized on sale of business, pre-tax |  |  |  |  |  | 223 |  |  |  |  |  |
Gain recognized on sale of business, after-tax |  |  |  |  |  | 425 |  |  |  |  |  |
Income taxes paid |  |  |  |  |  |  |  | $ 175 |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  | $ 1,200 |  |  |  |  |  |
Charge on early retirement of debt, cash retirement costs |  |  |  |  | $ 52 |  |  |  |  |  |  |
Loss on early retirement of debt, noncash charges |  |  |  |  | 6 |  |  |  |  |  |  |
Canadian Business Segment [Member] | 4.00% due July 15, 2021 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt retired |  |  |  |  | $ 500 |  |  |  |  |  |  |
Debt interest rate, stated percentage |  |  |  |  | 4.00% |  |  |  |  |  |  |
Debt, maturity date |  |  |  |  | Jul. 15, 2021 |  |  |  |  |  |  |
Canadian Business Segment [Member] | 3.25% due May 15, 2022 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt retired |  |  |  |  | $ 1,000 |  |  |  |  |  |  |
Debt interest rate, stated percentage |  |  |  |  | 3.25% |  |  |  |  |  |  |
Debt, maturity date |  |  |  |  | May 15, 2022 |  |  |  |  |  |  |
[1] | In conjunction with the sale of substantially all of its oil and gas assets and operations in Canada, Devon released the cumulative translation adjustment as part of its gain on the disposition of its Canadian business. See Note 19 for additional details.

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